Posted on May 17, 2011 at 12:48Since I haven't had any responses from the forum I thought I would post an example I wrote for the LM3S317 from Luminary micro. The ST micro reference manual doesn't give a procedure for initializing peripherals so I'm looking for an example.
/ LEDblink.c for the LM3S317
//Declare functions
int main(void);
void dummy_handler(void);
void isrPWM0(void);
//Define the vector table
__attribute__ ((section(''vectors'')))
int const VectorStackTop = 0x20000800; // Exception 0, Starting value of MSP
__attribute__ ((section(''vectors'')))
int (* const VectorMain) (void) = main; // Exception 1, Reset
__attribute__ ((section(''vectors'')))
int (* const VectorMNI) (void) = main; // Exception 2, NMI
__attribute__ ((section(''vectors'')))
void (* const VectorArray[]) (void) =
{
dummy_handler, // Exception 3, hard fault
dummy_handler, // Exception 4, MemManage fault
dummy_handler // Exception 5, Bus fault
};
//Dummy Handler
void dummy_handler(void)
{
return;
}
//*****************************************************************************
// Declarations
//*****************************************************************************
// Macro for Register access
#define HWREG(x) (*((volatile unsigned long *)(x)))
// System Control Registers
#define SYSCTL_BASE 0x400FE000 //Base address
#define RCGC2 HWREG(SYSCTL_BASE+0x0108)
// GPIO Registers
#define GPIOD 1<
#define GPIO_PORTD 0x40007000
#define GPIODATA_OFFSET 0x03FC //Data for 255 <
#define GPIODIR_OFFSET 0x0400
#define GPIODEN_OFFSET 0x051C
#define PDDATA HWREG(GPIO_PORTD+GPIODATA_OFFSET)
#define PDDIR HWREG(GPIO_PORTD+GPIODIR_OFFSET)
#define PDDEN HWREG(GPIO_PORTD+GPIODEN_OFFSET)
//Port Pins
#define P2 1<
//*****************************************************************************
// Initialize LED
//*****************************************************************************
void initLED (void)
{
RCGC2 |=GPIOD; //Enable Port D clocking
PDDIR |=P2; //Port D pin 2 output
PDDEN |=P2; //Port D pin 2 digital enable
}
//*****************************************************************************
// LED on
//*****************************************************************************
void LEDon (void)
{
PDDATA &= (~P2);
}
//*****************************************************************************
// LED off
//*****************************************************************************
void LEDoff (void)
{
PDDATA |=P2;
}
//*****************************************************************************
// Main
//*****************************************************************************
int main(void)
{
volatile unsigned long ulLoop;
initLED(); //Set up LED port
while(1)
{
for(ulLoop = 0; ulLoop < 0x10000; ulLoop++)
{
}
LEDon();
for(ulLoop = 0; ulLoop < 0x10000; ulLoop++)
{
}
LEDoff();
}
}
